/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineNotificationTransportManager.h
Send a notification using a specific transport
bool SendNotification ( [FNotificationTransportId](API\Plugins\OnlineSubsystem\FNotificationTransportId) TransportType, const [FOnlineNotification](API\Plugins\OnlineSubsystem\FOnlineNotification) & Notification )